A Horus Heresy Primarchs story set during the Great Crusade, A Lesson in Iron sees David Guymer tackle his favoured Iron Hands and give their primarch Ferrus Manus a little more time in the spotlight. Pursuing the fleeing remnants of the greenskin Rust empire and determined to finish them off, Ferrus takes his flagship – the Fist of Iron – into a strange warp rift. Instead of orks waiting for them, the Iron Hands find an unknown Imperial ship which appears to belong to their legion. What they find upon boarding that ship appears impossible, though it hints at a strange future.
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